Pressure problem

[DCL]

First, let me say hi too everyone here. I'm new on this site so I will let you know who am I.

I'm a owner of a small business in Quebec, Canada, only employee for servicing house appliances and small commercial refrigeration. I do think I'm pretty good in what I do since I'm beeing doing that for many years now.

I have a call last week for a commercial refrigerator who problem was water leeking on the floor. I been there to realize that high pressure was too low for evaporating the water. I call for a leaking tube on the high side. I change the underflow tubing, put everything under vacuum for the night, recharge it with R414B (originally R12) but the pressure was no good, about 30 psi on low and 150 psi on high and wont get under 55 F. I suppose that the compressor (AE4440) was bad and change it for a use one I got (AE4430), a bit smaller but should fit on. Even with the new compressor, I still got 30psi on low. I try too lower low side to where it belong, about 10 psi but now it wont go under 65 F.

I have no idea what is going on with that. Any idea will bee welcome!

[HvacStudentWTI]

im ethicaly against people changeing out compressors w/o running some tests on them to be dead certain that the compressor has failed at least do a test to ground with voltage then powerdown system and ohm it its just bad business practice MANUFACTUERS SPECS always nothing else if it calls for a AE4440 put an AE4440 in if the compressor didint fix any kind of problem (hopefully) u took the loss not the company because that makes u look real shady, sorry if im wrong and u made shure the compressor was bad but thats how it sounds and thats my opinion

[76olds]

HvacStudentWTI--This is a good example on how not to fix a cooler. Yes, you can run into this in the field.

[DCL]

Anyway, if anyone need more info about my corporate image, this is a job a got in the workshop and I'm testing everything trying to understand the problem, not to charge the big price to anyone. That beeing said, you may not have change the compressor but regarding to your topic, you havent done much yet... any idea of the problem?

[seraaco]

is the condenser clean?
cond fan run n blades ok?
subcooling?
txv ok?
superheat?

[Dchappa21]

yep... Need alot more info SH, SC, amb. temp, ect.